JP2017070963A - Bonded joint of dissimilar materials and bonding method by welding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the heat capacity of a steel material and suppress a temperature rise of the steel material due to heat generated as a result of welding so that fluctuation of a weld quality between a region of the welding start side and a region of the welding end side can be suppressed, when the steel material and an aluminium material are welded and joined together by making a plurality of penetration holes in the steel material at a joined part of the steel material and the aluminium material and filling the penetration holes with an aluminium-based filler material.SOLUTION: Intervals between penetration holes 1a in a welded part are made wider on the welding end side in the process of welding than on the welding start side, and/or an area of the penetration hole 1a in the welded part is made smaller.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a dissimilar joint and weld joint between materials having different melting points such as an iron-based material and an aluminum-based material used in vehicles such as automobiles, airplanes, ships, trains, etc., or machine parts, building structures, etc. Regarding the method.

  Dissimilar joints and welded joints that join iron-based materials (hereinafter simply referred to as steel materials) and aluminum-based materials (generally referred to as pure aluminum and aluminum alloys; hereinafter simply referred to as aluminum materials), which have different melting points. The method is disclosed in Patent Document 1 below. In this technique, a plurality of through holes are formed in a steel material at a joint portion between the steel material and the aluminum material, and welding is performed by filling a filler material of an aluminum-based material into these through holes. According to this technique, the filler material of the aluminum-based material is welded to the aluminum material as a base material, and the weld material overflowing from the through hole onto the steel surface at the time of welding is cooled to become a weld bead. By being put on the steel material around the through-hole, the different steel material and the aluminum material are joined.

Japanese Patent No. 4438691

  However, in the case of the above prior art, the amount of heat input to the welded portion increases with the progress of welding, and the melting amount of the filler material increases with the progress of welding. In extreme cases, the aluminum material as the base material melts. There is a fear. That is, there is a problem that the welding quality varies between the welding start side region and the welding end side region. This is because, in the above-described conventional technique, welding is continuously performed so that the weld line passes through each center line of the plurality of through-holes, so that welding heat accumulates in the steel material and the aluminum material as welding progresses.

  In view of such a problem, an object of the present invention is to provide a plurality of first members with a plurality of joints between the first member made of the first material and the second member made of the second material having a melting point lower than that of the first material. In the case where the first member and the second member are welded and joined by opening the through holes and filling the through holes with a filler material made of the second material, by increasing the heat capacity of the first member An object of the present invention is to suppress the variation in the welding quality between the welding start side region and the welding end side region by suppressing the temperature rise of the first member due to the heat generated with the welding.

  A first invention is a dissimilar joint joint in which a first member made of a first material and a second member made of a second material having a melting point lower than that of the first material are joined by a welded portion. A plurality of through holes are formed in the first member at the joining location, and a filler material made of the second material is filled in the through holes, and a welding end side in the progress of welding is Compared with the welding start side, the space | interval of the said through-hole is made wide, and / or the area of the said through-hole is made small.

  In the first invention, the first member includes steel materials such as ordinary steel and high-tensile steel (high tensile). The second member includes an aluminum material such as a pure aluminum material and an aluminum alloy material, and a magnesium material. Furthermore, a circle, an ellipse, a polygon, or the like can be adopted as the shape of the through hole.

  Moreover, the change of the space | interval of through-holes, or the change of the area of a through-hole may be changed continuously so that it may change sequentially according to progress of welding, or a welding location is divided into a plurality of groups, You may carry out in steps so that it may change for every group. The magnitude of change can be set as appropriate.

  According to the first invention, since the interval between the through holes is narrowed on the welding start side, the heat capacity as the first member per unit volume is relatively small, and the temperature of the first member is quickly increased after the start of welding. It can be raised to stabilize the weld. On the other hand, since the distance between the through holes is wider on the welding end side than on the welding start side, the heat capacity of the first member per unit volume is made relatively large, and the temperature rise accompanying welding at each welding location is suppressed. Can do. Or, on the welding end side, the area of the through hole is made smaller than that on the welding start side, and the heat capacity of the first member per unit volume is made relatively large. To do. Therefore, the dispersion | variation in the welding quality of a welding start side area | region and a welding end side area | region can be suppressed.

  According to a second aspect of the present invention, a plurality of through holes are formed in a steel material at a joint portion between the steel material and the aluminum material, and a portion filled with an aluminum-based filler material in these through holes is used as a welded portion. It is a dissimilar joint joint formed by joining an aluminum material, and the welding end side in the progress of welding has a larger interval between the through holes than the welding start side, and / or the area of the through hole It has been made smaller.

  In the second invention, the steel material includes ordinary steel, high-tensile steel (high tensile), and the like. The aluminum material includes a pure aluminum material, an aluminum alloy material, and the like.

  According to the second invention, since the interval between the through holes is narrowed on the welding start side, the heat capacity as a steel material per unit volume is relatively small, and the temperature of the steel material is increased immediately after the start of welding. Can be stabilized. On the other hand, since the distance between the through holes is wider on the welding end side than on the welding start side, the heat capacity of the steel material per unit volume is made relatively large, and the temperature rise accompanying welding at each welding point can be suppressed. . Alternatively, the welding end side reduces the area of the through hole as compared with the welding start side, and the heat capacity of the steel material per unit volume is relatively increased, so that the temperature rise due to welding at each welding point is suppressed. Therefore, the dispersion | variation in the welding quality of a welding start side area | region and a welding end side area | region can be suppressed.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the wall surface forming the through hole is inclined on the welding start side in the progress of welding compared to the welding end side.

  In the third invention, the inclination of the wall surface forming the through hole may be continuously inclined, or may be inclined as a whole by forming the wall surface in a stepped shape. Further, the angle and direction of the inclination can be set as appropriate. Further, the inclination may be changed continuously from the welding start side to the welding end side in the progress of welding, or the welding location may be divided into a plurality of groups and changed for each group. Also good.

  According to the third invention, since the wall on which the through hole is formed is inclined on the welding start side as compared with the welding end side, the amount of filler material filled in the through hole is determined by welding. The start side is large and the welding end side is small. Therefore, the welding start side stabilizes welding by increasing the amount of heat input, and the welding end side suppresses the heat input amount to the welding site in consideration of the accumulated amount of heat, and the welding start side region and the welding end side Variation in welding quality with the region can be suppressed.

  According to a fourth aspect of the present invention, a plurality of through holes are formed in the first member at a joint portion between the first member made of the first material and the second member made of the second material having a lower melting point than the first material. In which the first member and the second member are welded together by filling the through holes with the filler material made of the second material, and welding in the progress of welding. The end side widens the interval between the through holes and / or reduces the area of the through holes compared to the welding start side.

  In the fourth invention, the first member includes steel materials such as ordinary steel and high-tensile steel (high tensile). The second member includes an aluminum material such as a pure aluminum material and an aluminum alloy material, and a magnesium material. Furthermore, a circle, an ellipse, a polygon, or the like can be adopted as the shape of the through hole.

  Moreover, the change of the space | interval of through-holes, or the change of the area of a through-hole may be changed continuously so that it may change sequentially according to progress of welding, or a welding location is divided into a plurality of groups, You may carry out in steps so that it may change for every group. The magnitude of change can be set as appropriate.

  According to the fourth invention, since the interval between the through holes is narrowed on the welding start side, the heat capacity as the first member per unit volume is relatively small, and the temperature of the first member is quickly increased after the start of welding. It can be raised to stabilize the weld. On the other hand, since the distance between the through holes is wider on the welding end side than on the welding start side, the heat capacity of the first member per unit volume is made relatively large, and the temperature rise accompanying welding at each welding location is suppressed. Can do. Or, on the welding end side, the area of the through hole is made smaller than that on the welding start side, and the heat capacity of the first member per unit volume is made relatively large. To do. Therefore, the dispersion | variation in the welding quality of a welding start side area | region and a welding end side area | region can be suppressed.

  According to a fifth aspect of the present invention, welding is performed by welding a steel material and an aluminum material by opening a plurality of through holes in the steel material at a joining portion of the steel material and the aluminum material, and filling the through hole with a filler material of an aluminum-based material. In the joining method, the welding end side in the progress of welding increases the interval between the through holes and / or reduces the area of the through holes compared to the welding start side.

  In the fifth invention, the steel material includes ordinary steel, high-tensile steel (high tensile) and the like. The aluminum material includes a pure aluminum material, an aluminum alloy material, and the like.

  According to the fifth invention, since the interval between the through holes is narrowed on the welding start side, the heat capacity as a steel material per unit volume is relatively small, and the temperature of the steel material is increased immediately after the start of welding. Can be stabilized. On the other hand, since the distance between the through holes is wider on the welding end side than on the welding start side, the heat capacity of the steel material per unit volume is made relatively large, and the temperature rise accompanying welding at each welding point can be suppressed. . Alternatively, the welding end side reduces the area of the through hole as compared with the welding start side, and the heat capacity of the steel material per unit volume is relatively increased, so that the temperature rise due to welding at each welding point is suppressed. Therefore, the dispersion | variation in the welding quality of a welding start side area | region and a welding end side area | region can be suppressed.

  According to a sixth aspect of the present invention, in the fourth or fifth aspect of the present invention, welding is performed for each welding location corresponding to each through hole with a time interval so as to suppress accumulation of welding heat.

  According to the sixth aspect of the present invention, since it takes time to weld the next welded part after welding one welded part, accumulation of welding heat is suppressed. Therefore, the unbalance of the heat input amount to the welded part at each welded part is suppressed, and variations in welding quality between the welding start side area and the welding end side area can be suppressed.

  7th invention is welding in the order which pinches | interposes another welding location between the welding location which welds now, and the welding location which welds next among several welding locations in the said 6th invention.

  In the seventh invention, the other welding location may be a welding location where welding has been completed before the welding to be performed now, or a welding location where welding will be performed from now on.

  According to the seventh aspect, since the next welding location is located away from the current welding location, the influence of the heat accumulation due to the current welding on the welding of the next welding location is suppressed. Therefore, the unbalance of the heat input amount to the welded part at each welded part is suppressed, and variations in welding quality between the welding start side area and the welding end side area can be suppressed.

  In an eighth invention according to any one of the fourth to seventh inventions, the welding at each welding point is performed along the wall surface of the through hole.

  In order for the first member or steel material and the second member or aluminum material to be joined by welding, the filler material is welded to the second member or aluminum material, and the weld bead is the first member around the through-hole or It is important to cover the steel material, and it is not important that the weld bead is formed thick near the center of the through hole. According to the eighth invention, in order to form a filler material important for joining, welding along the wall surface of the through hole is focused on, thereby shortening the welding time and suppressing heat accumulation due to welding. Can do. Therefore, the imbalance of the heat input to the welded part at each welded part due to the effect of heat accumulation is suppressed, and variations in welding quality between the welding start side area and the welding end side area can be suppressed.

  According to a ninth invention, in any one of the fourth to eighth inventions, the welding end and / or the welding end and the welding end in the progress of welding are less than the welding start side so that the amount of heat input newly applied during welding is reduced. Alternatively, the welding speed is controlled.

  In the ninth aspect of the invention, the control for reducing the heat input can be performed by reducing the welding current amount and / or increasing the welding speed. The welding control may be open loop control or feedback control. Also, the control to reduce the heat input may be performed continuously so as to change sequentially according to the progress of welding, or it is performed step by step so that the welding points are divided into a plurality of groups and changed for each group. May be.

  According to the ninth aspect of the present invention, since the amount of heat input newly applied to each welding location is reduced with the progress of welding, even if the amount of heat accumulation due to welding increases with the progress of welding, the heat is accumulated. It is possible to suppress an increase in the amount of heat input to the welded part at the welded part due to the influence of. Therefore, the unbalance of the heat input to the welded part at each welded part is suppressed, and welding at each welded part is appropriately performed to suppress variations in weld quality between the weld start side area and the weld end side area. Can do.

  According to a tenth aspect of the present invention, in any one of the fourth to ninth aspects, the wall surface forming the through hole is inclined on the welding start side in the progress of welding compared to the welding end side.

  According to the tenth aspect of the invention, since the wall on which the through hole is formed is inclined on the welding start side compared to the welding end side, the amount of filler material filled in the through hole is determined by welding. The start side is large and the welding end side is small. For this reason, the welding start side stabilizes the welding by increasing the amount of heat input, and the welding end side suppresses the heat input amount to the welding site in consideration of the accumulated amount of heat, and the welding start side welding start side region and Variation in welding quality with the welding end side region can be suppressed.

It is a top view which shows 1st Embodiment of the dissimilar material joint and welding joint method of this invention. It is the II-II sectional view arrow enlarged view in FIG. It is the III-III sectional view taken on the line in FIG. It is a top view of the state which piled up the steel material and aluminum material in 1st Embodiment. It is the VV sectional view arrow enlarged view in FIG. It is a block diagram of the welding control system in a 1st embodiment. It is a graph which shows the change of the welding current in 1st Embodiment. It is a fragmentary sectional perspective view explaining the mode of welding work in a 1st embodiment. It is a top view of the state which piled up the steel material and aluminum material in 2nd Embodiment of the dissimilar material joining joint and welding joining method of this invention. It is a graph which shows the change of the welding current in 3rd Embodiment of the dissimilar material joint and welding joint method of this invention. It is a top view which shows 3rd Embodiment. It is the XII-XII line cross-sectional arrow enlarged view in FIG. FIG. 13 is a cross-sectional view taken along line XIII-XIII in FIG. 11. It is explanatory drawing explaining the mode of the welding operation in 4th Embodiment of the dissimilar material joint and welding joint method of this invention. It is explanatory drawing explaining 5th Embodiment of the dissimilar material joint and welding method of this invention. It is a graph which shows the control map content of the welding current in 6th Embodiment of the dissimilar material joint and welding joint method of this invention. It is a graph which shows the control map content of the welding speed in 7th Embodiment of the dissimilar material joint and welding joint method of this invention. It is sectional drawing similar to FIG. 2 in 8th Embodiment of the dissimilar material joint and welding joint method of this invention. It is sectional drawing similar to FIG. 3 in 8th Embodiment.

  FIG. 1 shows a first embodiment of the present invention. The first embodiment is a dissimilar material joint and weld joint method in which a flat steel material 1 and a flat aluminum material 2 are welded. Before welding, as shown in FIGS. 4 and 5, the joining portions of the steel material 1 and the aluminum material 2 are overlapped with each other, and a plurality of (here, six) penetrations are made in the steel material 1 in the overlapped portions. A hole 1a is opened. Therefore, in this state, a corresponding portion is exposed to the outside through the through hole 1a and through the through hole 1a of the aluminum material 2. Here, each through-hole 1a is formed along one straight line. The number, size, shape, arrangement, etc. of the through holes 1a can be changed as appropriate. The steel material 1 includes ordinary steel, high-tensile steel (high tensile), and the like, and the aluminum material 2 includes pure aluminum-based material, aluminum alloy-based material, and the like. The steel material 1 corresponds to the first member in the present invention, and the aluminum material 2 corresponds to the second member in the present invention.

  As shown in FIG. 4, in each through hole 1 a, the interval between the through holes 1 a is wider on the welding end side in the progress of welding than on the welding start side. That is, the distance between the through holes 1a is increased as the welding progresses from the left end through hole 1a to the right side in FIG. In FIG. 4, the distance between the leftmost through-hole 1a and the second through-hole 1a from the left is L1, the distance between the second through-hole 1a from the left and the third through-hole 1a from the left is L2, and the right side thereafter. The distance from the through-hole 1a is L3, L4, and L5. The magnitude of each distance is L1 <L2 <L3 <L4 <L5. Here, the through holes 1a have the same size and are circular with a diameter D0.

  In this case, welding is performed by arc welding, and arc welding is performed by positioning the welding torch 11 on the through hole 1a to be welded as shown in FIG. As a result, the welding rod 11a of the welding torch 11 is melted, and the melted filler material is filled in the through hole 1a. Here, the welding rod 11a is comprised with the aluminum-type material, and the filler material is welded with the aluminum material 2 of the site | part exposed from the through-hole 1a. As shown in FIGS. 1 to 3 and 8, welding is performed so that the filler material overflows from the through hole 1 a onto the surface of the steel material 1. The filler material overflowing on the surface of the steel material 1 is cooled and then covered with the steel material 1 around the through hole 1a as a weld bead 3. Thus, the aluminum material 2 is welded to the weld bead 3, and the steel material 1 is mechanically coupled to the weld bead 3. As a result, the steel material 1 and the aluminum material 2 which are different materials are joined. The weld bead 3 is a welded portion in the present invention.

  FIG. 6 shows a control system for controlling the current for arc welding energized in the welding torch 11 and the movement of the welding torch 11 to each welding location. A predetermined welding current is supplied to the welding torch 11 by the welding system 13, and a predetermined driving current is also supplied by the welding system 13 to the drive motor 12 for moving the welding torch 11 to each welding location. These welding currents and drive currents are controlled by a computer 14 connected to the welding system 13. The computer 14 inputs the welding current value actually supplied from the welding system 13 to the welding torch 11 in order to control the welding current to a preset current. Further, the computer 14 inputs a current position signal of the welding torch 11 from the welding system 13 in order to control the position of the welding torch 11. Further, the computer 14 inputs a current moving speed (welding speed) signal of the welding torch 11 from the welding system 13 to control the moving speed (welding speed) of the welding torch 11 during welding.

  FIG. 7 shows the welding current supplied from the welding system 13 to the welding torch 11. The welding current starts to be supplied from above the left end through-hole 1a in FIG. 4 which is a welding start point, and finishes supplying on the right end through-hole 1a in FIG. 4 which is a welding end point. Meanwhile, a constant current is supplied to the welding torch 11. At this time, the welding speed by the drive motor 12 is also constant.

  By welding in this way, since the interval between the through holes 1a is narrowed on the welding start side, the heat capacity as the steel material 1 per unit volume is relatively small, and the temperature of the steel material 1 immediately after the start of welding. Can be raised to stabilize the welding. On the other hand, since the distance between the through holes 1a at each welding location is wider on the welding end side than at the welding start side, the heat capacity of the steel material 1 per unit volume is made relatively large, and the temperature rise accompanying welding at each welding location. Can be suppressed. Therefore, the dispersion | variation in the welding quality of a welding start side area | region and a welding end side area | region can be suppressed.

  Since welding is continuously performed on each through hole 1a from the welding start point to the welding end point, the weld bead 3 is formed in a mountain-like shape with continuous peak positions as shown in FIGS. The

  FIG. 9 shows a second embodiment of the present invention. The feature of the second embodiment over the first embodiment is that the intervals between the through holes 1a are equal to each other, while the welding end side in the progress of welding penetrates at each welding point compared to the welding start side. The point is that the area of the hole 1a is reduced. Other configurations are the same as those of the first embodiment, and the repetitive description of the same portions is omitted.

  In 2nd Embodiment, the magnitude | size of the through-hole 1a is made small, so that it progresses to the right side from the through-hole 1a of the left end in FIG. 9 which is a welding start point. Each through-hole 1a is circular, and the diameter is D1 in the leftmost through-hole 1a in FIG. 9, D2 in the second through-hole 1a from the left, and the diameter of the through-hole 1a that continues to the right is D3. , D4, D5, and D6. And the magnitude | size of each diameter is made into D1> D2> D3> D4> D5> D6. Here, the intervals between the through holes 1a are equal to each other and set to L0.

  According to the second embodiment, since the area of the through hole 1a is increased on the welding start side, the heat capacity as the steel material 1 per unit volume is relatively small, and the temperature of the steel material 1 is quickly increased after the start of welding. To stabilize the welding. On the other hand, on the welding end side, since the size of the through-hole 1a at each welding location is gradually reduced as compared with the welding start side, the heat capacity of the steel material 1 per unit volume is increased toward the welding end side. The temperature rise accompanying welding in can be suppressed. Therefore, the dispersion | variation in the welding quality of a welding start side area | region and a welding end side area | region can be suppressed.

  FIG. 10 shows a third embodiment of the present invention. The feature of the third embodiment with respect to the first embodiment is that the welding current at the time of welding performed corresponding to each through hole 1a is a rectangular wave intermittent at each welding position. Other configurations are the same as those of the first embodiment, and the repetitive description of the same portions is omitted.

  In the third embodiment, a welding current controlled to a predetermined value is supplied to the welding torch 11 while the welding torch 11 moves at a constant speed along each through hole 1a and is positioned on each through hole 1a. During the movement between the through holes 1a, the welding current supplied to the welding torch 11 is zero.

  By controlling the welding current in this way, welding is performed only while the welding torch 11 is positioned on the through hole 1a, and the welding current is interrupted when moving between the through holes 1a. Therefore, the heat generated with welding is suppressed by the amount by which the welding current is interrupted, and the amount of heat accumulated in the steel material 1 and the aluminum material 2 is suppressed. That is, an increase in the amount of heat accumulated with the progress of welding is suppressed. Although constant welding heat is generated at the time of welding in each through-hole 1a, since the amount of heat accumulated before that does not increase with the progress of welding, the unbalance of the heat input to the welded part at each welding point is suppressed, Variation in welding quality between the welding start side region and the welding end side region can be suppressed.

  In this way, the welding bead corresponding to each welding location as shown in FIGS. 11 to 13 is not performed by continuously welding each welding location corresponding to each through-hole 1a, but independently for each welding location. 3 are formed independently of each other. That is, the apex P of the thickness of each weld bead 3 from the aluminum material 2 is formed for each weld location.

  FIG. 14 shows a fourth embodiment of the present invention. The feature of the fourth embodiment with respect to the third embodiment (see FIG. 10) is that the welding order for each welding location is changed. Other configurations are the same as those of the third embodiment, and the repetitive description of the same portions is omitted.

  FIG. 14 shows the order of welding performed on each through-hole 1a. In FIG. 14, the pattern indicated by “A” indicates a case where a plurality of through holes 1 a arranged in series are welded in the order of outer side, inner side, outer side, and inner side. In the figure, the numbers indicate the welding order. Therefore, in this case, first, welding is performed on the leftmost through hole 1a in FIG. 14 indicated by "1", and then welding is performed on the through hole 1a near the center indicated by "2". Thereafter, welding is performed in numerical order.

  In the pattern indicated by “D” as a comparative example, among the plurality of through holes 1a arranged in series, welding is performed in order from the left end through hole 1a to the right end through hole 1a in FIG. Numbers indicate welding sequence.

  When welding is performed using the pattern indicated by “A”, the welding locations are spaced apart from each other with the other welding locations sandwiched between the locations where the welding is performed. For this reason, the influence of the previously performed welding heat on the next welding is suppressed as compared with the case of performing welding with the pattern indicated by “D”. Therefore, the imbalance of the heat input to the welded part at each welded part is suppressed, and variations in welding quality between the welding start side area and the welding end side area can be suppressed.

  In the pattern indicated by “B”, welding is repeatedly performed on a plurality of through holes 1 a arranged in series, one by one from the left end through hole 1 a toward the right end through hole 1 a in FIG. 14. In the figure, the numbers indicate the welding order. Moreover, the pattern shown by "C" shows the case where it welds in order of an inner side, an outer side, an inner side, and the outer side with respect to the several through-hole 1a arranged in series. In the figure, the numbers indicate the welding order. Therefore, in this case, first, welding is performed on the through hole 1a near the middle in FIG. 14 indicated by "1", and then welding is performed on the rightmost through hole 1a indicated by "2". Thereafter, welding is performed in numerical order.

  In the case of performing welding with the patterns indicated by “B” and “C”, as in the case of the pattern indicated by “A”, the positions where the welding locations are separated from each other with the other welding locations sandwiched between the locations where the welding is performed. It becomes. For this reason, the influence of the previously performed welding heat on the next welding is suppressed as compared with the case of performing welding with the pattern indicated by “D”. Therefore, the imbalance of the heat input to the welded part at each welded part is suppressed, and variations in welding quality between the welding start side area and the welding end side area can be suppressed.

  FIG. 15 shows a fifth embodiment of the present invention. The feature of the fifth embodiment with respect to the first embodiment is that welding at each welding point is performed along the wall surface of the through hole 1a. Other configurations are the same as those of the first embodiment, and the repetitive description of the same portions is omitted.

  In 5th Embodiment, the movement locus | trajectory at the time of welding of the welding rod 11a in the welding torch 11 is made to follow the inner side of the wall surface of the through-hole 1a, as shown by the arrow of FIG. Therefore, the filler material accompanying welding is filled along the wall surface of the through hole 1a, the amount of the filler material filled in the central portion of the through hole 1a is suppressed, and the thickness of the weld bead 3 is suppressed.

  In order to join the steel material 1 and the aluminum material 2 by welding, it is important that the filler material is welded to the aluminum material 2 and that the weld bead 3 is placed on the steel material 1 around the through hole 1a. It is not important that the weld bead 3 is formed thick near the center of 1a. According to the fifth embodiment, in order to form an important filler material for joining, welding along the wall surface of the through-hole 1a is focused on shortening welding time and suppressing heat accumulation due to welding. can do. Therefore, the imbalance of the heat input to the welded part at each welded part due to the effect of heat accumulation is suppressed, and variations in welding quality between the welding start side area and the welding end side area can be suppressed.

  FIG. 16 shows a sixth embodiment of the present invention. The feature of the sixth embodiment over the third embodiment (see FIG. 10) is that the welding end side in the progress of welding reduces the amount of heat input newly added with welding compared to the welding start side. In this way, the welding current is controlled. Other configurations are the same as those of the third embodiment, and the repetitive description of the same portions is omitted.

  In the sixth embodiment, the welding current is gradually reduced with the progress of welding. Such control of the welding current is stored in advance as a map in the memory of the computer 14 as shown in FIG. The computer 14 performs feedback control via the welding system 13 so that the welding current set by the map is obtained. At this time, the welding voltage and the welding speed are not changed with the progress of welding, and are constant.

  According to the sixth embodiment, the amount of heat input newly applied to each welding location is reduced as the welding progresses. Therefore, even if the amount of heat accumulated by welding increases as the welding progresses, It is possible to suppress an increase in the amount of heat input to the welded part at the welded part due to the influence of the accumulation of the heat. Therefore, the unbalance of the heat input to the welded part at each welded part is suppressed, and welding at each welded part is appropriately performed to suppress variations in weld quality between the weld start side area and the weld end side area. Can do.

  FIG. 17 shows a seventh embodiment of the present invention. The feature of the seventh embodiment over the first embodiment is that the welding speed on the welding end side in the progress of welding is set so as to reduce the amount of heat input newly added with welding compared to the welding start side. It is a point to control. Other configurations are the same as those of the first embodiment, and the repetitive description of the same portions is omitted.

  In the seventh embodiment, the welding speed is gradually increased as welding progresses. Such welding speed control is stored in advance as a map in the memory of the computer 14 as shown in FIG. 17 in relation to the welding position. The computer 14 performs feedback control via the welding system 13 so that the welding speed set by the map is obtained. In this case, the switching of the welding speed is performed corresponding to each through hole 1a. At this time, the welding current is constant without changing with the progress of welding.

  Also in the seventh embodiment, it is possible to achieve the same function and effect as those of the sixth embodiment described above.

  18 and 19 show an eighth embodiment of the present invention. The feature of the eighth embodiment over the first embodiment is that the welding start side in the progress of welding is formed with an inclined wall surface that forms a through-hole in the welded portion compared to the welding end side. It is. Other configurations are the same as those of the first embodiment, and the repetitive description of the same portions is omitted.

  In the eighth embodiment, as shown in FIG. 19, the wall surface of the left end through-hole 1a is formed to be greatly inclined in the view in which welding is started, and the wall surface of the right end through-hole 1a in FIG. Is not inclined. And the through-hole 1a between the through-holes 1a at the left and right ends in the figure is such that the inclination of the wall surface gradually decreases as it moves from the left side to the right side in the figure.

  Since it formed in this way, the quantity of the filler material with which the inside of the through-hole 1a is filled is large on the welding start side where welding is started, and is reduced on the welding end side where welding is completed. Therefore, welding is stabilized by increasing the amount of heat input on the welding start side, and the welding end side suppresses the heat input to the welding site in consideration of the accumulated amount of heat, and the welding start side region and the welding end side region Variation in welding quality can be suppressed. In FIGS. 18 and 19, the wall surface is inclined so that the wall surface faces upward, but the wall surface may face downward. When facing downward as in the latter case, the welding surface between the filler metal and the aluminum material 2 as the base material can be increased without changing the amount of the filler material. Bonding strength can be increased.

  As mentioned above, although specific embodiment was described, this invention is not limited to those external appearances and structures, A various change, addition, and deletion are possible in the range which does not change the summary of this invention. For example, in the above embodiment, welding is performed by arc welding, but laser welding or the like may be used as long as the filler material can be filled in the through hole 1a and the weld bead 3 can be formed.

1 Steel (first member)
1a Through hole 2 Aluminum material (second member)
3 Weld beads (welded part)
11 welding torch 11a welding rod 12 drive motor 13 welding system 14 computer

Claims (10)

A dissimilar joint joint formed by joining a first member made of a first material and a second member made of a second material having a melting point lower than that of the first material by a welded portion,
A plurality of through holes are opened in the first member at the joint location, and the filler material made of the second material is filled in the through holes,
A dissimilar joint joint in which the interval between the through holes is wider on the welding end side in the progress of the welding and / or the area of the through holes is smaller than the welding start side. A plurality of through holes are formed in the steel material at the joint between the steel material and the aluminum material, and the steel material and the aluminum material are joined using a portion filled with the filler material of the aluminum-based material in these through holes as a welded portion. A dissimilar material joint,
A dissimilar joint joint in which the interval between the through holes is wider on the welding end side in the progress of the welding and / or the area of the through holes is smaller than the welding start side. In claim 1 or 2,
The dissimilar joint joint in which the wall surface which forms the said through-hole inclines in the welding start side in the progress of welding compared with the welding end side. A plurality of through holes are formed in the first member at a joint portion between the first member made of the first material and the second member made of the second material having a lower melting point than the first material. A welding joining method of welding the first member and the second member by filling a filler material made of the second material into a through hole,
A welding joining method in which a welding end side in the progress of welding widens the interval between the through holes and / or reduces an area of the through holes compared to a welding start side. A welding joining method in which a plurality of through holes are formed in a steel material at a joining portion of the steel material and the aluminum material, and the steel material and the aluminum material are welded and joined by filling a filler material of an aluminum-based material in the through holes. ,
A welding joining method in which a welding end side in the progress of welding widens the interval between the through holes and / or reduces an area of the through holes compared to a welding start side. In claim 4 or 5,
A welding joining method in which welding is performed at each welding location corresponding to each through hole with a time interval so as to suppress accumulation of welding heat. In claim 6,
A welding joining method in which welding is performed in an order in which another welding location is sandwiched between a welding location where welding is performed now and a welding location where welding is performed next among a plurality of welding locations. In any of claims 4 to 7,
The welding in each welding location is a welding joining method performed along the wall surface of the through hole. In any one of claims 4 to 8,
A welding joining method for controlling the welding current and / or the welding speed so that the welding end side in the progress of welding is less than the welding start side, and the amount of heat input newly added with welding is reduced. In any of claims 4 to 9,
The welding joining method in which the wall surface forming the through-hole is formed on the welding start side in the progress of welding in an inclined manner as compared with the welding end side.

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